大坝混凝土早期热膨胀系数试验研究  

Experimental study on the thermal expansion coefficient of dam concrete at early age

作　　者：钱文勋 张燕迟[1,2] 

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]水利部水工新材料工程技术研究中心,江苏南京210029

出　　处：《水利水运工程学报》2010年第3期71-74,共4页Hydro-Science and Engineering

基　　金：国家自然科学基金委员会;二滩水电开发有限责任公司雅砻江水电开发联合研究基金资助项目(50539040);水利部公益性行业科研专项经费资助项目(200701014)

摘　　要：热膨胀系数是大坝混凝土热学、体积稳定性能的重要表征参数,但在混凝土硬化初期常被忽视,目前测定混凝土早期热膨胀系数的方法尚无统一规定.采用非接触位移传感器结合循环式恒温水浴装置,通过小幅温升的方式实现了原位连续测试混凝土早期热膨胀系数;试验测试了不同配比的大坝混凝土早期热膨胀系数.结果显示,大坝混凝土在硬化后72 h内热膨胀系数变化显著,随后至7 d相对稳定,7 d的测值与标准方法测得混凝土90 d龄期的热膨胀系数基本一致.Thermal expansion coefficient（TEC） is an important parameter for the thermal property and volume stability property of dam concrete,but it is often ignored at early age.There is no common method used to test TEC of concrete at early age now.In this paper,non-contact displacement transducer and constant temperature water baths are applied to measure the TEC of different dam concrete at early age.In the process of testing,temperature-rising range is limited,and method of continuous testing in-situ is adopted.The results indicate that TEC of dam concrete is evidently changed in 72 hours after setting and relatively steady at late age.These results of TEC at 7 days are in good agreement with those from standard testing at 90 days.

关 键 词：大坝混凝土 早期 热膨胀系数 非接触位移传感器 

分 类 号：TV431[水利工程—水工结构工程] TU528.01[建筑科学—建筑技术科学]